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   <div id="projectbrief">Reranking framework for structure prediction and discriminative language modeling</div>
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<div class="title">example-feature-extractor.H</div>  </div>
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<a href="example-feature-extractor_8_h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// Copyright 2012, Google Inc.</span>
<a name="l00002"></a>00002 <span class="comment">// All rights reserved.</span>
<a name="l00003"></a>00003 <span class="comment">//</span>
<a name="l00004"></a>00004 <span class="comment">// Redistribution and use in source and binary forms, with or without</span>
<a name="l00005"></a>00005 <span class="comment">// modification, are permitted provided that the following conditions are</span>
<a name="l00006"></a>00006 <span class="comment">// met:</span>
<a name="l00007"></a>00007 <span class="comment">//</span>
<a name="l00008"></a>00008 <span class="comment">//   * Redistributions of source code must retain the above copyright</span>
<a name="l00009"></a>00009 <span class="comment">//     notice, this list of conditions and the following disclaimer.</span>
<a name="l00010"></a>00010 <span class="comment">//   * Redistributions in binary form must reproduce the above</span>
<a name="l00011"></a>00011 <span class="comment">//     copyright notice, this list of conditions and the following disclaimer</span>
<a name="l00012"></a>00012 <span class="comment">//     in the documentation and/or other materials provided with the</span>
<a name="l00013"></a>00013 <span class="comment">//     distribution.</span>
<a name="l00014"></a>00014 <span class="comment">//   * Neither the name of Google Inc. nor the names of its</span>
<a name="l00015"></a>00015 <span class="comment">//     contributors may be used to endorse or promote products derived from</span>
<a name="l00016"></a>00016 <span class="comment">//     this software without specific prior written permission.</span>
<a name="l00017"></a>00017 <span class="comment">//</span>
<a name="l00018"></a>00018 <span class="comment">// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS</span>
<a name="l00019"></a>00019 <span class="comment">// &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT</span>
<a name="l00020"></a>00020 <span class="comment">// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR</span>
<a name="l00021"></a>00021 <span class="comment">// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT</span>
<a name="l00022"></a>00022 <span class="comment">// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,</span>
<a name="l00023"></a>00023 <span class="comment">// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT</span>
<a name="l00024"></a>00024 <span class="comment">// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,</span>
<a name="l00025"></a>00025 <span class="comment">// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY</span>
<a name="l00026"></a>00026 <span class="comment">// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT</span>
<a name="l00027"></a>00027 <span class="comment">// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE</span>
<a name="l00028"></a>00028 <span class="comment">// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span>
<a name="l00029"></a>00029 <span class="comment">// -----------------------------------------------------------------------------</span>
<a name="l00030"></a>00030 <span class="comment">//</span>
<a name="l00031"></a>00031 <span class="comment">//</span>
<a name="l00036"></a>00036 <span class="comment"></span>
<a name="l00037"></a>00037 <span class="preprocessor">#ifndef RERANKER_EXAMPLE_FEATURE_EXTRACTOR_H_</span>
<a name="l00038"></a>00038 <span class="preprocessor"></span><span class="preprocessor">#define RERANKER_EXAMPLE_FEATURE_EXTRACTOR_H_</span>
<a name="l00039"></a>00039 <span class="preprocessor"></span>
<a name="l00040"></a>00040 <span class="preprocessor">#include &lt;iostream&gt;</span>
<a name="l00041"></a>00041 <span class="preprocessor">#include &lt;string&gt;</span>
<a name="l00042"></a>00042 <span class="preprocessor">#include &lt;vector&gt;</span>
<a name="l00043"></a>00043 
<a name="l00044"></a>00044 <span class="preprocessor">#include &quot;<a class="code" href="feature-extractor_8_h.html" title="Provides the reranker::FeatureExtractor interface.">feature-extractor.H</a>&quot;</span>
<a name="l00045"></a>00045 
<a name="l00046"></a>00046 <span class="keyword">namespace </span>reranker {
<a name="l00047"></a>00047 
<a name="l00048"></a>00048 <span class="keyword">using</span> std::cout;
<a name="l00049"></a>00049 <span class="keyword">using</span> std::string;
<a name="l00050"></a>00050 <span class="keyword">using</span> std::vector;
<a name="l00051"></a>00051 
<a name="l00059"></a><a class="code" href="classreranker_1_1_example_feature_extractor.html">00059</a> <span class="keyword">class </span><a class="code" href="classreranker_1_1_example_feature_extractor.html" title="This class illustrates how to write a FeatureExtractor implementation.">ExampleFeatureExtractor</a> : <span class="keyword">public</span> <a class="code" href="classreranker_1_1_feature_extractor.html" title="An abstract base class/interface for all feature extractors.">FeatureExtractor</a> {
<a name="l00060"></a>00060  <span class="keyword">public</span>:
<a name="l00062"></a><a class="code" href="classreranker_1_1_example_feature_extractor.html#a554d2558be8184c87e107beaee7693b3">00062</a>   <a class="code" href="classreranker_1_1_example_feature_extractor.html#a554d2558be8184c87e107beaee7693b3" title="Constructs an instance, emitting that fact to cout.">ExampleFeatureExtractor</a>() : <a class="code" href="classreranker_1_1_feature_extractor.html" title="An abstract base class/interface for all feature extractors.">FeatureExtractor</a>() {
<a name="l00063"></a>00063     cout &lt;&lt; <span class="stringliteral">&quot;ExampleFeatureExtractor: creating instance!&quot;</span> &lt;&lt; endl;
<a name="l00064"></a>00064   }
<a name="l00066"></a><a class="code" href="classreranker_1_1_example_feature_extractor.html#a23bf6814cd58ce48b6cca75dd5238377">00066</a>   <span class="keyword">virtual</span> <a class="code" href="classreranker_1_1_example_feature_extractor.html#a23bf6814cd58ce48b6cca75dd5238377" title="Destroys this instance.">~ExampleFeatureExtractor</a>() { }
<a name="l00067"></a>00067 
<a name="l00068"></a><a class="code" href="classreranker_1_1_example_feature_extractor.html#a53c0cf9f66922b417d08f42a816cdd35">00068</a>   <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="classreranker_1_1_example_feature_extractor.html#a53c0cf9f66922b417d08f42a816cdd35">RegisterInitializers</a>(<a class="code" href="classreranker_1_1_initializers.html" title="A container for all the member initializers for a particular Factory-constructible instance...">Initializers</a> &amp;initializers) {
<a name="l00069"></a>00069     initializers.<a class="code" href="classreranker_1_1_initializers.html#a9554990729db9c5d1b85925fc3c42d91">Add</a>(<span class="stringliteral">&quot;arg&quot;</span>, &amp;arg_);
<a name="l00070"></a>00070     initializers.<a class="code" href="classreranker_1_1_initializers.html#a9554990729db9c5d1b85925fc3c42d91">Add</a>(<span class="stringliteral">&quot;strvec&quot;</span>, &amp;strvec_);
<a name="l00071"></a>00071     initializers.<a class="code" href="classreranker_1_1_initializers.html#a9554990729db9c5d1b85925fc3c42d91">Add</a>(<span class="stringliteral">&quot;b&quot;</span>, &amp;b_);
<a name="l00072"></a>00072   }
<a name="l00073"></a>00073 
<a name="l00083"></a><a class="code" href="classreranker_1_1_example_feature_extractor.html#a174f1626e9220dbb072fcf08f534ddb2">00083</a>   <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="classreranker_1_1_example_feature_extractor.html#a174f1626e9220dbb072fcf08f534ddb2" title="Initializes this instance with the specified argument string.">Init</a>(<span class="keyword">const</span> <a class="code" href="classreranker_1_1_environment.html" title="An interface for an environment in which variables of various types are mapped to their values...">Environment</a> *env, <span class="keyword">const</span> <span class="keywordtype">string</span> &amp;arg) {
<a name="l00084"></a>00084     cout &lt;&lt; <span class="stringliteral">&quot;ExampleFeatureExtractor: set arg to \&quot;&quot;</span> &lt;&lt; arg_ &lt;&lt; <span class="stringliteral">&quot;\&quot;&quot;</span> &lt;&lt; endl;
<a name="l00085"></a>00085     cout &lt;&lt; <span class="stringliteral">&quot;ExampleFeatureExtractor: set strvec to {&quot;</span>;
<a name="l00086"></a>00086     <span class="keywordflow">for</span> (vector&lt;string&gt;::const_iterator it = strvec_.begin();
<a name="l00087"></a>00087          it != strvec_.end();
<a name="l00088"></a>00088          ++it) {
<a name="l00089"></a>00089       cout &lt;&lt; <span class="stringliteral">&quot;\&quot;&quot;</span> &lt;&lt; *it &lt;&lt; <span class="stringliteral">&quot;\&quot;, &quot;</span>;
<a name="l00090"></a>00090     }
<a name="l00091"></a>00091     cout &lt;&lt; <span class="stringliteral">&quot;}&quot;</span> &lt;&lt; endl;
<a name="l00092"></a>00092     cout &lt;&lt; <span class="stringliteral">&quot;ExampleFeatureExtractor: set b to &quot;</span> &lt;&lt; (b_ ? <span class="stringliteral">&quot;true&quot;</span> : <span class="stringliteral">&quot;false&quot;</span>)
<a name="l00093"></a>00093          &lt;&lt; endl;
<a name="l00094"></a>00094 
<a name="l00095"></a>00095     cout &lt;&lt; <span class="stringliteral">&quot;Environment during construction: &quot;</span> &lt;&lt; endl;
<a name="l00096"></a>00096     env-&gt;<a class="code" href="classreranker_1_1_environment.html#a07d328d2d2bbe0f62e7348f590e6529c" title="Prints a human-readable string of all the variables in this environment, their types and...">Print</a>(cout);
<a name="l00097"></a>00097   }
<a name="l00098"></a>00098 
<a name="l00109"></a><a class="code" href="classreranker_1_1_example_feature_extractor.html#a8b12be611b02ee796b2bafb3e594cdd6">00109</a>   <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="classreranker_1_1_example_feature_extractor.html#a8b12be611b02ee796b2bafb3e594cdd6" title="Extracts &ldquo;compiled&rdquo; features.">Extract</a>(<a class="code" href="classreranker_1_1_candidate.html" title="A class to represent a candidate in a set of candidates that constitutes a training instance for a re...">Candidate</a> &amp;candidate,
<a name="l00110"></a>00110                        <a class="code" href="classreranker_1_1_feature_vector.html">FeatureVector&lt;int,double&gt;</a> &amp;features) {
<a name="l00111"></a>00111     features.<a class="code" href="classreranker_1_1_feature_vector.html#a541f26184a4407f62eb5dad8102cf375" title="Increments the weight of the specified feature by the specified amount.">IncrementWeight</a>(0, 5.0);
<a name="l00112"></a>00112     features.<a class="code" href="classreranker_1_1_feature_vector.html#a541f26184a4407f62eb5dad8102cf375" title="Increments the weight of the specified feature by the specified amount.">IncrementWeight</a>(27, 4.2);
<a name="l00113"></a>00113   }
<a name="l00114"></a>00114 
<a name="l00120"></a><a class="code" href="classreranker_1_1_example_feature_extractor.html#ac45ecd80f2929c8dbbb705e36a407718">00120</a>   <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="classreranker_1_1_example_feature_extractor.html#ac45ecd80f2929c8dbbb705e36a407718" title="Extracts symbolic (or string) features.">ExtractSymbolic</a>(<a class="code" href="classreranker_1_1_candidate.html" title="A class to represent a candidate in a set of candidates that constitutes a training instance for a re...">Candidate</a> &amp;candidate,
<a name="l00121"></a>00121                                <a class="code" href="classreranker_1_1_feature_vector.html">FeatureVector&lt;string,double&gt;</a> &amp;symbolic_features)
<a name="l00122"></a>00122   {
<a name="l00123"></a>00123     symbolic_features.<a class="code" href="classreranker_1_1_feature_vector.html#a541f26184a4407f62eb5dad8102cf375" title="Increments the weight of the specified feature by the specified amount.">IncrementWeight</a>(arg_ + <span class="stringliteral">&quot;foo&quot;</span>, 3.2);
<a name="l00124"></a>00124     symbolic_features.<a class="code" href="classreranker_1_1_feature_vector.html#a541f26184a4407f62eb5dad8102cf375" title="Increments the weight of the specified feature by the specified amount.">IncrementWeight</a>(arg_ + <span class="stringliteral">&quot;bar&quot;</span>, 6734.3);
<a name="l00125"></a>00125     <span class="keyword">const</span> <span class="keywordtype">string</span> &amp;candidate_sentence = candidate.<a class="code" href="classreranker_1_1_candidate.html#abb17414a33453509e2b7cfaf8be02baa" title="Returns the raw data (typically the sentence) for this candidate.">raw_data</a>();
<a name="l00126"></a>00126     <span class="keywordtype">size_t</span> first_space_idx = candidate_sentence.find_first_of(<span class="stringliteral">&quot; &quot;</span>);
<a name="l00127"></a>00127     <span class="keyword">const</span> <span class="keywordtype">string</span> feature = candidate_sentence.substr(0, first_space_idx);
<a name="l00128"></a>00128     symbolic_features.<a class="code" href="classreranker_1_1_feature_vector.html#a541f26184a4407f62eb5dad8102cf375" title="Increments the weight of the specified feature by the specified amount.">IncrementWeight</a>(arg_ + feature, 34.2);
<a name="l00129"></a>00129   }
<a name="l00130"></a>00130 
<a name="l00131"></a>00131  <span class="keyword">private</span>:
<a name="l00132"></a>00132   <span class="comment">// data members</span>
<a name="l00133"></a>00133   <span class="keywordtype">string</span> arg_;
<a name="l00134"></a>00134   vector&lt;string&gt; strvec_;
<a name="l00135"></a>00135   <span class="keywordtype">bool</span> b_;
<a name="l00136"></a>00136 };
<a name="l00137"></a>00137 
<a name="l00138"></a><a class="code" href="namespacereranker.html#a5132ca05a2361988c75ce1bb95c35065">00138</a> <a class="code" href="feature-extractor_8_h.html#a7271aa7d6a37191a08c076a838c7ca36" title="Registers the FeatureExtractor  with the specified subtype TYPE with the FeatureExtractor  Factory...">REGISTER_FEATURE_EXTRACTOR</a>(<a class="code" href="classreranker_1_1_example_feature_extractor.html" title="This class illustrates how to write a FeatureExtractor implementation.">ExampleFeatureExtractor</a>)
<a name="l00139"></a>00139 
<a name="l00140"></a>00140 }  <span class="comment">// namespace reranker</span>
<a name="l00141"></a>00141 
<a name="l00142"></a>00142 <span class="preprocessor">#endif</span>
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